Let \( f: D \rightarrow R \) be defined as \( f(x)=\frac{x^{2}+2 x+...

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Let \( f: D \rightarrow R \) be defined as \( f(x)=\frac{x^{2}+2 x+a}{x^{2}+4 x+3 a} \) where \( D \) and \( R \) denote the domain of
\( \mathrm{P} \) \( f \) and the set of all real numbers respectively. If \( f \) is surjective mapping then the

W range of \( a \) is :
(a) \( 0 \leq a \leq 1 \)
(b) \( 0a \leq 1 \)
(c) \( 0 \leq a1 \)
(d) \( 0a1 \)
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